What is CVE-2025-66403?

CVE-2025-66403 is a medium-severity vulnerability in Error311 Filerise, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2025-12-01.

How severe is CVE-2025-66403?

Medium severity. CVSS v3 base score is 4.6 out of 10.

XSS in Error311 Filerise

CVE-2025-66403

FileRise is a self-hosted web-based file manager with multi-file upload, editing, and batch operations. Prior to 2.2.3, a stored cross-site scripting (XSS) vulnerability exists in the Filerise application due to improper handling of uploaded SVG files. The application accepts user-supplied SVG uploads without sanitizing or restricting embedded script content. When a malicious SVG containing inline JavaScript or event-based payloads is uploaded, it is later rendered directly in the browser whenever viewed within the application. Because SVGs are XML-based and allow scripting, they execute in the origin context of the application, enabling full stored XSS. This vulnerability is fixed in 2.2.3.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (11.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.

Affected products

Error311 Filerise — versions < 2.2.3
Filerise

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2025-66403?: CVE-2025-66403 is a medium-severity vulnerability in Error311 Filerise, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2025-12-01.
How severe is CVE-2025-66403?: Medium severity. CVSS v3 base score is 4.6 out of 10.